what is the mechanical advantageof a single fixed pulley?

Question

what is the mechanical advantage of afixed pulley?

Answer 1

There is no mechanical advantage to using a single pulley.

All a single pulley can do is make it more convenient to lift a load to a location located above the ground that normally does not have easy access, as to a barn loft, etc.

Answer 2

The same amount of work is necessary for the load to reach the same height as it would without the pulley. The magnitude of the force is reduced, but it must act through a longer distance. The effort needed to pull a load up is roughly the weight of the load divided by the number of wheels. The more wheels there are, the less efficient a system is, because of more friction between the rope and the wheels.

In equilibrium, the force F on the pulley axle is equal and opposite to the sum of the tensions in each line leaving the pulley, and these tensions are equal.

Answer 3

Since the pulley is fixed, the net force is equal to 0.

F(up) = F(down)

F(up) is supplied by the ceiling. Since the pulley is fixed, we can assume that the ceiling cracking and people dying won't be an issue.

F(down) is split into two equal portions, one on each side of the rope. Assuming that one is pulling oneself up (as with a rope-pulley scaffold system), one has to pull with half the force to move oneself up the system (given that the ground is the center of our axis system).

Answer 4

The mechanical advantage is 1. It simply changes the applied force direction.

Answer 5

1:1

Answer 6

no these people are wrong...you have to apply exactly the same force, magnitude yadada,,, it is just in a different direction. you need more than one pulley to make it easier to lift something.